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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2025 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "location.h"
#include "config.h"
#include "../util/util.h"
#include <cx/linked_list.h>

#define DIR_CHECK_ARGC(n) if(argc != n) { \
        log_ereport(LOG_FAILURE, "%s directive argc != %d", name.ptr, n); \
        return 1; \
    } 

static void location_list_add(WSLocation *location, WSLocation *sub) {
    void **begin = (void**)&location->children_begin;
    void **end = (void**)&location->children_end;
    cx_linked_list_add(begin, end, offsetof(WSLocation, prev), offsetof(WSLocation, next), sub);
}

static int add_location_config(const CxAllocator *a, WSLocation *location, ConfigNode *dir) {
    cxmutstr name = dir->name;
    int argc = serverconfig_directive_count_args(dir);
    if(!cx_strcasecmp(name, "DirectoryIndex")) {
        DIR_CHECK_ARGC(1);
        location->config.set_dirindex = TRUE;
        location->config.dirindex = util_getboolean_s(cx_strcast(dir->args->value), FALSE);
    } else if(!cx_strcasecmp(name, "DocumentRoot")) {
        DIR_CHECK_ARGC(1);
        location->config.docroot = cx_strdup_a(a, dir->args->value);
    } else if(!cx_strcasecmp(name, "Location")) {
        WSLocation *sub_location = cfg_location_get(a, dir);
        if(!sub_location) {
            return 1;
        }
        location_list_add(location, sub_location);
    }
    
    return 0;
}


WSLocation* cfg_location_get(const CxAllocator *a, ConfigNode *obj) { 
    WSLocationMatch match = WS_LOCATION_MATCH_EXACT;
    cxmutstr match_str;
    
    int regex_flags = REG_EXTENDED;
    int argc = serverconfig_directive_count_args(obj);
    if(argc == 2) {
        // arg0: match type
        cxmutstr type_str = obj->args->value;
        if(!cx_strcmp(type_str, "=")) {
            // noop
        } else if(!cx_strcmp(type_str, "^~")) {
            match = WS_LOCATION_MATCH_PREFIX;
        } else if(!cx_strcmp(type_str, "~")) {
            match = WS_LOCATION_MATCH_CS_REGEX;
        } else if(!cx_strcmp(type_str, "~*")) {
            match = WS_LOCATION_MATCH_CI_REGEX;
            regex_flags |= REG_ICASE;
        } else {
            log_ereport(LOG_FAILURE, "Location: unknown operator %.*s", (int)type_str.length, type_str.ptr);
            return NULL;
        }
        
        // arg1: match_string
        match_str = obj->args->next->value;
    } else if(argc == 1) {
        // arg0: match_string
        match_str = obj->args->value;
    } else if(argc > 2) {
        log_ereport(LOG_FAILURE, "Location directive must have 0-2 args");
        return NULL;
    }
    
    WSLocation *location = cxZalloc(a, sizeof(WSLocation));
    location->match_string = cx_strdup_a((a), match_str);
    
    if(match == WS_LOCATION_MATCH_CS_REGEX || match == WS_LOCATION_MATCH_CI_REGEX) {
        if(regcomp(&location->regex, match_str.ptr, regex_flags)) {
            log_ereport(LOG_FAILURE, "Location: cannot compile regex pattern %s", match_str.ptr);
            return NULL;
        }
    }
    
    ConfigNode *dir = obj->children_begin;
    while(dir) {
        if(dir->type == CONFIG_NODE_OBJECT || dir->type == CONFIG_NODE_DIRECTIVE) {
            if(add_location_config(a, location, dir)) {
                log_ereport(LOG_FAILURE, "Location %s: abort", match_str.ptr);
                return NULL;
            }
        }
        dir = dir->next;
    }
    
    
    
    return location;
}